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onsemi KSB546Y
- Part No.:
- KSB546Y
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
KSB546Y.pdf
- Description:
- TRANS PNP 150V 2A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,267
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Product details
Overview
KSB546Y from ON Semiconductor is a PNP epitaxial silicon power transistor designed for TV vertical deflection output stages, featuring -200 V collector-base voltage, -2 A DC collector current, 25 W collector dissipation at TC=25°C, hFE classification Y (120–240), and TO-220 package with base-collector-emitter pinout.
For engineers reviewing the KSB546Y datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, safe operating area behavior, complementary pairing with KSD401, and discontinued-status guidance for legacy system support and obsolescence mitigation.
Technical Context
This device operates as a high-voltage, medium-current PNP switching transistor optimized for linear vertical sweep in CRT television deflection circuits. Its -150 V VCEO rating and 5 MHz fT support stable operation under repetitive pulse loads with controlled saturation and low leakage (ICBO ≤ -50 µA).
The KSB546Y's thermal design centers on junction-to-case conduction via its TO-220 metal tab, enabling 25 W dissipation at 25°C case temperature with derating to zero at 150°C. Its SOA curve defines safe boundaries across voltage, current, and pulse width-critical for flyback energy handling in vertical output stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | -200 V - Withstands peak reverse voltage in collector-base junction during vertical retrace without breakdown. |
| VCEO | -150 V - Maximum sustainable collector-emitter voltage under open-base conditions in vertical output switching. |
| IC (DC) | -2 A - Supports continuous vertical scan current drive for standard CRT yoke loads. |
| PC (TC=25°C) | 25 W - Enables high-power linear amplification in unregulated deflection stage with heatsink mounting. |
| hFE (Y-class) | 120–240 - Ensures predictable base drive requirements and gain stability across production lots for consistent deflection linearity. |
| fT | 5 MHz - Sufficient bandwidth for vertical frequency harmonics (15.734 kHz fundamental + harmonics) without phase degradation. |
| VCE(sat) | -1 V @ IC = -500 mA, IB = -50 mA - Minimizes conduction loss and heat generation during active sweep period. |
Pinout & Package
Package: TO-220 (JEDEC variation AB), through-hole, insulated tab, single-gauge leadframe (A1 = 0.51–0.61 mm), 3-pin configuration with integral heatsink mounting surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives negative base current to turn on PNP conduction; requires current-limiting resistor in driver stage. |
| 2 (Collector) | High-side power node | Connected to CRT yoke primary and B+ supply; carries full vertical sweep current and flyback energy. |
| 3 (Emitter) | Reference/return path | Typically tied to ground or low-impedance return; establishes emitter-follower or common-base bias reference. |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | -200 V supports robust flyback voltage tolerance in CRT vertical deflection without snubber overdesign. |
| Y-class hFE binning | 120–240 gain range ensures tight base drive consistency across production units for repeatable linearity calibration. |
| TO-220 thermal interface | Metal tab enables direct mechanical and thermal coupling to heatsink, critical for sustained 25 W dissipation. |
| Complementary pairing | Explicitly matched to KSD401 NPN for push-pull vertical output designs requiring balanced gain and SOA. |
Applications
| TV Vertical Deflection Output | CRT Monitor Sweep Stage |
|---|---|
|
Use Scenario: Driving the vertical deflection yoke in analog CRT televisions during 60 Hz (NTSC) or 50 Hz (PAL) field scanning. IC Role / Device Role / Timing Role: PNP power switch amplifying sawtooth waveform to generate magnetic field sweep; operates in linear region during active trace and switches during retrace. Use Value: -150 V VCEO and -2 A IC enable full-field deflection without saturation collapse or secondary breakdown under flyback stress. |
Use Scenario: Generating precise vertical raster movement in professional CRT monitors requiring stable geometry and minimal pincushion distortion. IC Role / Device Role / Timing Role: High-linearity PNP output transistor in feedback-controlled vertical amplifier stage, biased for Class-A/AB operation. Use Value: 120–240 hFE (Y-class) and -1 V VCE(sat) ensure consistent gain matching and low conduction loss across units for factory calibration. |
| Legacy Broadcast Equipment | Industrial CRT-Based HMI |
|
Use Scenario: Field-generation circuitry in analog broadcast test equipment (e.g., waveform monitors, vectorscopes) using CRT displays. IC Role / Device Role / Timing Role: Vertical output device delivering stable, low-noise sweep current with minimal thermal drift over extended operation. Use Value: 150°C max junction temperature and SOA-limited pulse capability allow reliable operation in fanless enclosures with ambient up to 70°C. |
Use Scenario: Embedded human-machine interface terminals in industrial control panels where CRT-based operator displays remain in service. IC Role / Device Role / Timing Role: Replacement component for field-service repair of aging vertical deflection boards in DIN-rail mounted HMIs. Use Value: TO-220 footprint and pinout (1-Base, 2-Collector, 3-Emitter) ensure mechanical and electrical compatibility with original PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| KSB546 (R-class) | hFE = 40–80; lower gain, higher VCE(sat) variability; same VCBO/VCEO/IC/PC ratings and TO-220 package. | Suitable for non-critical deflection stages where gain tolerance is relaxed and base drive margin is ample. | Select only if existing design used R-bin and calibration tolerances accommodate lower hFE. |
| KSB772 | VCBO = -40 V, VCEO = -30 V, IC = -3 A, PC = 30 W, hFE = 60–240 - lower voltage rating but higher current and power. | Not suitable for CRT vertical deflection; appropriate for low-voltage switching regulators or audio output stages. | Reject for vertical deflection use due to insufficient -150 V VCEO; consider only in new low-voltage designs. |
Compared with KSB546Y, the R-class KSB546 offers reduced gain consistency but identical voltage/current/power specs, while KSB772 trades critical high-voltage capability for higher current-making neither a drop-in replacement, but both useful for distinct legacy or derivative designs.
Availability
KSB546Y is available at Aetrix Electronics and suitable for CRT television repair, legacy broadcast equipment maintenance, and industrial HMI panel refurbishment requiring stable component supply amid ongoing obsolescence management.
Supply support for KSB546Y includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of high-performance silicon solutions for automotive, industrial, cloud computing, and consumer electronics.
The KSB546Y belongs to ON Semiconductor's legacy bipolar power transistor product line, engineered specifically for analog video deflection and high-voltage linear amplification in CRT-based systems.
FAQ
What does the 'Y' suffix indicate in KSB546Y?
The 'Y' suffix denotes the hFE (DC current gain) classification bin: KSB546Y has a guaranteed hFE range of 120–240 at VCE = -10 V and IE = -0.4 A. This tighter gain band ensures predictable base drive requirements and improved linearity in vertical deflection circuits compared to R- or O-class variants. The KSB546Y maintains identical voltage, current, and thermal ratings as other KSB546 variants.
Is KSB546Y still in active production?
No-KSB546Y is officially discontinued and not recommended for new designs per ON Semiconductor's documentation (Rev. 1, May 2024). It remains available through authorized distributors and Aetrix Electronics for legacy system support, repair, and obsolescence mitigation, but long-term supply is subject to remaining inventory and no future manufacturing commitment.
Can KSB546Y be used as a direct replacement for KSB546 (R-class)?
KSB546Y is mechanically and electrically pin-compatible with KSB546 (R-class) in TO-220 package, sharing identical VCBO, VCEO, IC, PC, and pinout. However, its higher hFE (120–240 vs. 40–80) may reduce required base drive current and improve linearity-but may also shift bias points in unmodified circuits. Validation in the target application is essential before substitution.
What is the safe operating area (SOA) limitation for KSB546Y?
The KSB546Y SOA is defined by thermal, secondary breakdown, and current limits. At DC operation, it supports up to -2 A at -10 V VCE, derating linearly to ~-0.5 A at -100 V. For pulsed operation (1 ms), it sustains up to -1.5 A at -120 V. Exceeding SOA boundaries risks thermal runaway or localized junction failure-especially during flyback transients in vertical deflection.
How does KSB546Y pair with KSD401 in push-pull configurations?
KSB546Y is explicitly designated as the PNP complement to the NPN KSD401. Both share matched voltage ratings (KSD401: VCEO = +150 V), similar hFE ranges (KSD401: 100–320), TO-220 packages, and optimized SOA for symmetrical vertical output stages. Their pairing enables balanced current sourcing/sinking and minimized crossover distortion in classic push-pull CRT deflection amplifiers.
KSB546Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 50µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 400mA, 10V
- Power - Max:
- 25 W
- Frequency - Transition:
- 5MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
KSB546Y FAQ
1.How can I place an order for KSB546Y through Aetrix?
Please submit a Request for Quotation (RFQ) for KSB546Y on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for KSB546Y reliable?
The price and inventory of KSB546Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSB546Y is usually 5 days.
3.What payment methods are accepted for KSB546Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSB546Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSB546Y?
KSB546Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSB546Y order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for KSB546Y?
For technical support, including KSB546Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSB546Y requirements.
6.How does Aetrix verify that KSB546Y is sourced from the original manufacturer or authorized distributors?
All KSB546Y products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KSB546Y meets industry standards.
7.What is the process for return or replacement of KSB546Y?
All KSB546Y units undergo pre-shipment inspection (PSI). If there is an issue with KSB546Y, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The KSB546Y part is unused and in its original packaging.
Return procedure for KSB546Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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